Question about 2001 Mazda MPV

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Rear heater working ok , but front heater blows cold ?

Heaters working rear is hot and the front stays cold , bothe front and rear operating knobs appear to be ok

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  • Contributor
  • 41 Answers

Best case is you accidentally left the AC switch on... Check for pinched/bent hoses near firewall of passenger side. Worst case is the heater core is clogged. In this case someone can backflush the heater core to clear it. Good luck!

Posted on Jun 10, 2015

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Posted on Jan 02, 2017

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tommyboinow
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SOURCE: 2001 mazda 626 heater/temp gauge?

your head gaskets are bad.... This is a common plroblem wiht those symptoms.

Posted on Nov 26, 2008

  • 7 Answers

SOURCE: 2004 mazda mpv- rear heater fan only works on high

My bet is that there's a relay at fault... but first: have you checked the fuses? the high blower speed draws a lot of power, so sometimes it's fused separately from the other speeds. This means that your fuse for the slow blower speeds could be blown. Also, because theblower draws so much power, you'd need a HUGE switch to switch it directly, so they use a low-power switch inside the car, and a relay (usually under the hood, but sometimes under a seat (check your owner's manual) to do the heavy work. These are often split the same way, with the high blower on one, and the slow on the other. These are the things that are easier to check, but it could just be that the switch is bad. Mid 90s Land rovers and Range Rovers have the same problem, where the only blower speed that works is HIGH, making the cabin sound like a wind tunnel... Just the switch. The switch can be a pain to replace if you do it yourself, but do check the fuses first, and see if you can find the relays. if the fuses are okay, and you find the relays, try to find the one that's for the fan and swap it out, it shouldn't be more than 3-4 dollars from an auto parts store, just bring in the old one to match it, or swap it for another relay that's nearby and has the same pins. If the swap works, just remember to get another relay, because the one you "borrow" from another circuit could be the door locks or the headlights or something else important....

Posted on Jun 22, 2009

digritz
  • 530 Answers

SOURCE: 1992 mazda mx3 heater blows warm, but not hot.

Hot air is dependent on the coolant temperature and the heater core. There are several things that can cause your problem. The easiest to check is the coolant level in the radiator\reservoir. There must be enough coolant to flow freely between the engine and the heater core. The next is the thermostat. If the thermostat is not closing it would prevent the the coolant from reaching a high enough temperature to allow for hot air. The thermostat is not expensive or difficult to replace. The third thing is a blockage in the heater core. Flush the coolant system properly can sometimes take care of this. If it does not the only alternative is a new heater core.
Hope this helps.

Posted on Sep 12, 2009

  • 174 Answers

SOURCE: When driving, heater blows warm air. When idling, cold air.

It sounds to me like you have a plugged heater core, or one that is beginning to plug. With the engine running, carefully feel the two hoses that lead from the engine into the heater core in the firewall. If one of those hoses is colder than the other one then you heater core needs to be replaced. This involves removing a bunch of stuff under the dash. Sometimes it's pretty easy and sometimes not. Start by removing the glove box and you should be able to see the plastic housing for the heater core.

Posted on Dec 15, 2009

  • 1 Answer

SOURCE: 2004 Mazda RX8 Heater problem

There is a well known problem that is a manufacturer's defect with the soldered connection on the circuit board behind the temperature knob. There is a fix to re-solder the connections but the dealer will gladly take $450 to replace it with the same bad board that will last you a while. Look for the link to show you how to fix it yourself.

Posted on Dec 19, 2009

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1 Answer

Why does the front heater only blow cold air


you must listen when changing the temperature from cold to hot to see if you can hear the heater duct opening & closing,if not could be a vacuum hose is disconnected or broken,or the vacuum motor that moves the duct door has broken you might hear a hissing sound,or a cable has broken,I don't think it's a fuse ,because it's working when you turn it on,those are good possible causes I have given you have fun & I hope you have small hands,limited space acess

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Have 2004 suburban 1500 heat does not work for rear. Auto will be at operating temp heat from dash is hot but rear is cold. Any suggestions?


AFTER YOUR TRUCK IS AT OPERATING TEMP CHECK BOTH OF THE HEATER HOSES GOING INTO THE REAR HEATER AND SEE IF ONE IS HOT AND THE OTHER ONE IS COLD. IF THEY ARE AS I MENTIONED THEN YOUR PROBLEM COULD BE THE REAR HEATER CONTROL VALVE (if the valve is located after where you checked the hoses) OR YOU HAVE A PLUGGED HEATER CORE AND IT NEEDS TO BE FLUSHED OR REPLACED. IF BOTH HOSES ARE COLD THEN CHECK WHERE THE REAR HEATER CONTROL VALVE IS LOCATED AND IF IT IS BEFORE THE REAR HEATER HOSES START THEN SEE IF THE HOSE GOING INTO THE REAR HEATER CONTROL VALVE IS HOT GOING IN AND COLD GOING OUT AND IF IT IS REPLACE THE VALVE AND THAT WILL FIX YOUR REAR HEATING PROBLEMS ! GOOD LUCK ! MICHAEL...

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2006 Pontiac Montana SV6 Front heater only blowing warm. Rear heater blowing cold.


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Dec 10, 2010 | 2006 Pontiac Montana SV6

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Our heater takes about 20 mins to blow warm air, and then if we are stopped at a light and the engine is idling it gets cold. Also, in the summer when we turn on the a/c it blows hotin the front and cool...


always check the coolant first, then feel both heater hoses to see if they are equally hot.
if one hot and one cold, then the heater core is clogged
if both hot then you have a blend door problem.
on the a/c there's some time a rear unit that blow cool air even the front does not

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Jan 26, 2009 | 2002 GMC Yukon XL

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2001 tahoe front heater not working, rear heater blows warm air


Notorious for plugged heater cores. Also updated plastic restriction couplers mounted at heater core available from dealer. Try back flushing heater core. Run engine till its at operating temperature then carefully hold the inlet and outlet hose breifly with heater fan on high if hoses are nearly the same temp then flow is good , if not then core is plugged.

Jan 18, 2009 | 2001 Chevrolet Tahoe

1 Answer

Rear heater blows cold


First thing I'd do is make sure your coolant level at radiator is up to proper level.Your auxiliary heat/cool unit should be in behind the right rear interior panel . (passenger side) If you remove that panel & check the hoses or lines going into it, they should be warm/hot to touch when heat on & engine warmed up to operating temperature. If not, it's most likely a problem with the electronic control, not allowing coolant flow to it, and I'm almost sure that the control cannot be fixed, but needs to be replaced. Triple check all your fuses for heater controls etc, but if everything else is working except the heat part, I'm guessing control at dash needs replacement.

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